50 W Power Resistor, Thick Film Technology, TO-220

Applications

• 50 W at 25 °C heatsink mounted
• Adjusted by sand trimming
• Leaded or surface mount versions
• High power to size ratio
• Non inductive element
• The user must choose according to the working conditions of the component (power, room temperature). Maximum working temperature must not exceed 155 °C. The dissipated power is simply calculated by the following ratio:
• P: Expressed in W ΔT: Difference between maximum working temperature and room temperature RTH (j - c): Thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal resistance of the component: (Special Features Table) RTH (c - h): Thermal resistance value measured between outer side of the resistor and upper side of the heatsink. This is the thermal resistance of the interface (grease, thermal pad), and the quality of the fastening device RTH (h - a): Thermal resistance of the heatsink
• Example: RTH (c - a): For RTO 50 power rating 13 W at ambient temperature +30 °C Thermal resistance RTH (j - c): 2.6 °C/W Considering equation (1) we have: ΔT ≤ 155 °C - 30 °C = 125 °C RTH (j - c) + RTH (c - h) + RTH (h - a) = = = 9.6 °C/W RTH (c - a) + RTH (h - a) ≤ 9 .6 °C/W - 2.6 °C/W ≤ 7 °C/W